<template>
    <div class="prodetail">
      <van-nav-bar fixed title="商品详情页" left-arrow @click-left="$router.go(-1)" />

      <van-swipe :autoplay="4000" @change="onChange">
        <van-swipe-item v-for="(image, index) in images" :key="index">
          <img :src="image.external_url" />
        </van-swipe-item>

        <template #indicator>
          <div class="custom-indicator">{{ current + 1 }} / {{ images.length }}</div>
        </template>
      </van-swipe>

      <!-- 商品说明 -->
      <div class="info">
        <div class="title">
          <div class="price">
            <span class="now">￥{{ detail.goods_price_min }}</span>
            <span class="oldprice">￥{{ detail.goods_price_max }}</span>
          </div>
          <div class="sellcount">已售 {{ detail.goods_sales }} 件</div>
        </div>
        <div class="msg text-ellipsis-2">
          {{ detail.goods_name }}
        </div>

        <div class="service">
          <div class="left-words">
            <span><van-icon name="passed" />七天无理由退货</span>
            <span><van-icon name="passed" />48小时发货</span>
          </div>
          <div class="right-icon">
            <van-icon name="arrow" />
          </div>
        </div>
      </div>

      <!-- 商品评价 -->
      <div class="comment">
        <div class="comment-title">
          <div class="left">商品评价 ({{ total }}条)</div>
          <div class="right">查看更多 <van-icon name="arrow" /> </div>
        </div>
        <div class="comment-list">
          <div class="comment-item" v-for="item in commentList" :key="item.comment_id">
            <div class="top">
              <img :src="item.user.avatar_url || defaultImg" alt="">
              <div class="name">{{ item.user.nick_name }}</div>
              <van-rate :size="16" :value="item.score / 2" color="#ffd21e" void-icon="star" void-color="#eee"/>
            </div>
            <div class="content">
              {{ item.content }}
            </div>
            <div class="time">
              {{ item.create_time }}
            </div>
          </div>
        </div>
      </div>

      <!-- 商品描述 -->
      <div class="desc" v-html="detail.content">
      </div>

      <!-- 底部 -->
      <div class="footer">
        <div @click="$router.push('/')" class="icon-home">
          <van-icon name="wap-home-o" />
          <span>首页</span>
        </div>
        <div @click="$router.push('/cart')" class="icon-cart">
          <span v-if="cartTotal > 0" class="num">{{ cartTotal }}</span>
          <van-icon name="shopping-cart-o" />
          <span>购物车</span>
        </div>
        <div @click="addFn" class="btn-add">加入购物车</div>
        <div @click="buyNow" class="btn-buy">立刻购买</div>
      </div>

      <!-- 加入购物车/立即购买 公用的弹层 -->
      <van-action-sheet v-model="showPannel" :title="mode === 'cart' ? '加入购物车' : '立刻购买'">
        <div class="product">
          <div class="product-title">
            <div class="left">
              <img :src="detail.goods_image" alt="">
            </div>
            <div class="right">
              <div class="price">
                <span>¥</span>
                <span class="nowprice">{{ detail.goods_price_min }}</span>
              </div>
              <div class="count">
                <span>库存</span>
                <span>{{ detail.stock_total }}</span>
              </div>
            </div>
          </div>
          <div class="num-box">
            <span>数量</span>
            <!-- v-model 本质上 :value 和 @input 的简写 -->
            <CountBox v-model="addCount"></CountBox>
          </div>

          <!-- 有库存才显示提交按钮 -->
          <div class="showbtn" v-if="detail.stock_total > 0">
            <div class="btn" v-if="mode === 'cart'" @click="addCart">加入购物车</div>
            <div class="btn now" v-else @click="goBuyNow">立刻购买</div>
          </div>

          <div class="btn-none" v-else>该商品已抢完</div>
        </div>
      </van-action-sheet>
    </div>
  </template>

<script>
import { getProComments, getProDetail } from '@/api/product'
import defaultImg from '@/assets/default-avatar.png'
import CountBox from '@/components/CountBox.vue'
import { addCart } from '@/api/cart'
import loginConfirm from '@/mixins/loginConfirm'

export default {
  name: 'ProDetail',
  mixins: [loginConfirm],
  components: {
    CountBox
  },
  data () {
    return {
      images: [],
      current: 0,
      detail: {},
      total: 0, // 评价总数
      commentList: [], // 评价列表
      defaultImg,
      showPannel: false, // 控制弹层的显示隐藏
      mode: 'cart', // 标记弹层状态
      addCount: 1, // 数字框绑定的数据
      cartTotal: 0 // 购物车角标
    }
  },
  computed: {
    goodsId () {
      return this.$route.params.id
    }
  },
  created () {
    this.getDetail()
    this.getComments()
  },
  methods: {
    onChange (index) {
      this.current = index
    },
    async getDetail () {
      const { data: { detail } } = await getProDetail(this.goodsId)
      this.detail = detail
      this.images = detail.goods_images
      console.log(this.images)
    },
    async getComments () {
      const { data: { list, total } } = await getProComments(this.goodsId, 3)
      this.commentList = list
      this.total = total
    },
    addFn () {
      this.mode = 'cart'
      this.showPannel = true
    },
    buyNow () {
      this.mode = 'buyNow'
      this.showPannel = true
    },
    async addCart () {
      if (this.loginConfirm()) {
        return
      }
      const { data } = await addCart(this.goodsId, this.addCount, this.detail.skuList[0].goods_sku_id)
      this.cartTotal = data.cartTotal
      this.$toast('加入购物车成功')
      this.showPannel = false
    },
    goBuyNow () {
      if (this.loginConfirm()) {
        return
      }
      this.$router.push({
        path: '/pay',
        query: {
          mode: 'buyNow',
          goodsId: this.goodsId,
          goodsSkuId: this.detail.skuList[0].goods_sku_id,
          goodsNum: this.addCount
        }
      })
    }
  }
}
</script>

  <style lang="less" scoped>
  .prodetail {
    padding-top: 46px;
    ::v-deep .van-icon-arrow-left {
      color: #333;
    }
    img {
      display: block;
      width: 100%;
    }
    .custom-indicator {
      position: absolute;
      right: 10px;
      bottom: 10px;
      padding: 5px 10px;
      font-size: 12px;
      background: rgba(0, 0, 0, 0.1);
      border-radius: 15px;
    }
    .desc {
      width: 100%;
      overflow: scroll;
      ::v-deep img {
        display: block;
        width: 100%!important;
      }
    }
    .info {
      padding: 10px;
    }
    .title {
      display: flex;
      justify-content: space-between;
      .now {
        color: #fa2209;
        font-size: 20px;
      }
      .oldprice {
        color: #959595;
        font-size: 16px;
        text-decoration: line-through;
        margin-left: 5px;
      }
      .sellcount {
        color: #959595;
        font-size: 16px;
        position: relative;
        top: 4px;
      }
    }
    .msg {
      font-size: 16px;
      line-height: 24px;
      margin-top: 5px;
    }
    .service {
      display: flex;
      justify-content: space-between;
      line-height: 40px;
      margin-top: 10px;
      font-size: 16px;
      background-color: #fafafa;
      .left-words {
        span {
          margin-right: 10px;
        }
        .van-icon {
          margin-right: 4px;
          color: #fa2209;
        }
      }
    }

    .comment {
      padding: 10px;
    }
    .comment-title {
      display: flex;
      justify-content: space-between;
      .right {
        color: #959595;
      }
    }

    .comment-item {
      font-size: 16px;
      line-height: 30px;
      .top {
        height: 30px;
        display: flex;
        align-items: center;
        margin-top: 20px;
        img {
          width: 20px;
          height: 20px;
        }
        .name {
          margin: 0 10px;
        }
      }
      .time {
        color: #999;
      }
    }

    .footer {
      position: fixed;
      left: 0;
      bottom: 0;
      width: 100%;
      height: 55px;
      background-color: #fff;
      border-top: 1px solid #ccc;
      display: flex;
      justify-content: space-evenly;
      align-items: center;
      .icon-home, .icon-cart {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        font-size: 14px;
        .van-icon {
          font-size: 24px;
        }
      }
      .btn-add,
      .btn-buy {
        height: 36px;
        line-height: 36px;
        width: 120px;
        border-radius: 18px;
        background-color: #ffa900;
        text-align: center;
        color: #fff;
        font-size: 14px;
      }
      .btn-buy {
        background-color: #fe5630;
      }
    }
  }

  .tips {
    padding: 10px;
  }

  // 弹层的样式
  .product {
    .product-title {
      display: flex;
      .left {
        img {
          width: 90px;
          height: 90px;
        }
        margin: 10px;
      }
      .right {
        flex: 1;
        padding: 10px;
        .price {
          font-size: 14px;
          color: #fe560a;
          .nowprice {
            font-size: 24px;
            margin: 0 5px;
          }
        }
      }
    }

    .num-box {
      display: flex;
      justify-content: space-between;
      padding: 10px;
      align-items: center;
    }

    .btn, .btn-none {
      height: 40px;
      line-height: 40px;
      margin: 20px;
      border-radius: 20px;
      text-align: center;
      color: rgb(255, 255, 255);
      background-color: rgb(255, 148, 2);
    }
    .btn.now {
      background-color: #fe5630;
    }
    .btn-none {
      background-color: #cccccc;
    }
  }

  .footer .icon-cart {
    position: relative;
    padding: 0 6px;
    .num {
      z-index: 999;
      position: absolute;
      top: -2px;
      right: 0;
      min-width: 16px;
      padding: 0 4px;
      color: #fff;
      text-align: center;
      background-color: #ee0a24;
      border-radius: 50%;
    }
  }
  </style>
